The attack on Mumbai's lifeline, the local trains on July 11, 2006, left 209 dead, over 700 injured and several others shocked and horrified. It has been one of this decade's most violent terror attacks.Now, the arrest of a Students Islamic Movement of India (SIMI) operative, 33-year-old dentist, Dr Mohammed Abrar Aarief Maajid may lead to more clues that point to Ujjain as the place where the ghastly plot was hatched.